#include<iostream>
using namespace std;

int main()
{
	int x, y;
	cin >> x >> y;
	x = abs(x);
	y = abs(y);
	if ((x + y) % 2 != 0 && x + y < 10 && x < 7 && y < 7)cout << "YES" << endl;
	else if (x + y == 0 || x + y == 2 || (x + y == 4 && x != 2) || (x > 1 && y > 1 && x + y == 6))cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}